Ricoh FT4460, Service Manual, Page: 103 / 413

28 February 1989
6. IMAGE TRANSFER
6.1 PRE-TRANSFER LAMP (PTL)
After the latent image is developed but before the image is transferred to the
copy paper [D], the drum surface is illuminated by the pre-transfer lamp [A].
This illumination reduces the negative potential on the drum surface [B]. This
prevents the toner particles from being re-attracted to the negatively charged
drum during the paper separation process. It also makes image transfer and
paper separation easier.
6.2 IMAGE TRANSFER
A high negative voltage (-5.6 kilovolts) is applied to the transfer corona wire
[C], and the corona wire generates negative ions. These negative ions are
applied to the copy paper [D], and the negative charge attracts the positively
charged toner away from the drum and onto the paper. In addition, the paper
is held against the drum by the positive counter charge on the drum.
2-50